The thing about altitude sickness is that everyone gets it, just to varying degrees. There are 2 things that majorly help that have already been mentioned. Try to spend a night at an elevation partially up the mountain. If you go from 800' to 10,000' in a day, your going to have problems. The other one is the water thing. Dehydration is a huge factor in altitude sickness. Drink even when your not thirsty.

I' ve heard of the asprin thing, but I really have no idea if it' s fact of fiction, I would lean towards fiction though.

If you do become ill when hunting, move down the mountain! There are people who die from altitude sickness.

Also, don' t let something like this get in your head and think that it' s going to affect your hunt. Most cases of altitude sickness can be taken care of with a few asprin and a nap.